I have recorded famliy photos onto DVD using Pinnacle and other programmes but cannot play them on my new Daewoo DVB-T VCR/DVD Recorder. Is there any freeware I can use to convert my DVDs to a compatible format?

You first may need to download additional codecs. Codecs are required to encode and/or decode (play) audio and video. One such freeware application is the K-Lite Codec Pack 5.8.3 which can be found here:
Free-Codecs.com : Download K-Lite Codec Pack 5.8.3 FULL, K-Lite Codec Pack 5.8.3 STANDARD, K-Lite Codec Pack 5.8.3 BASIC : K-Lite Codec Pack is a collection of codecs and related tools (http://www.free-codecs.com/download/K_lite_codec_pack.htm)

As far as DVD conversion freeware/software is concerned, you may try this link:
Products of Any Video Converter, DVD Converter, DVD Ripper, DVD Cloner to convert AVI to MPEG, video to iPhone, video to iPod, Zune, PSP (http://www.any-video-converter.com/products/)

Hope this helps.

Many thanks for your kind help.
glis-glis